Observations of the binary accreting pulsar VELA X-1 with the SIGMA telescope

Details Observations of the binary accreting pulsar VELA X-1 with the SIGMA telescope Observations of the binary accreting pulsar VELA X-1 with the SIGMA telescope

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..399l&link_type=abstract

Astronomy and Astrophysics, v.300, p.399

Astronomy and Astrophysics

Astrophysics

9

X-Rays: Stars, Cosmology: Observations, Pulsars: Individual: Vela X-1

Scientific paper

The high mass binary pulsar Vela X-1 has been observed 15 times by the SIGMA imaging telescope during 1990-1994. The source reached a maximum luminosity in the 30-60keV range of 8x10^35^erg/s (assuming d=2kpc) during a flare lasting 6 hours on June 1st, 1992. Periodic flux variations with a period of nearly 284s. have been detected during this flare. By summing all the observations, we have also detected the source with a 30-60keV luminosity of 10^35^erg/s. The spectrum recorded during the two states are both well fitted by a power law of index -3.5 between 30 and 60keV.

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